2.1 Nature of Matter Comp Check

Front

What is the group in the periodic table that has 2 electrons in its valence shell?

Back

Group 2.

Front

What is the ratio of hydrogen to oxygen in H2O?

Back

2:1.

Front

What is atomic mass?

Back

The number of protons and neutrons inside the nucleus.

Front

What is atomic number?

Back

The number of protons only.

Front

What is an ion?

Back

An atom with more protons or electrons that is charged.

Front

What are atoms?

Back

The smallest unit of matter.

Front

What is the significance of valence electrons?

Back

They determine how an atom can bond with other atoms.

Front

What is the difference between protons and neutrons?

Back

Protons are positively charged, while neutrons have no charge.

Front

What is the charge of an electron?

Back

Negative.

Front

How do you calculate the atomic mass of an element?

Back

By adding the number of protons and neutrons.